Realistic stories are stories that are based upon true stories, are actually true, or could realistically happen. To write a realistic story, write about something that has happened to you before, like a family tradition, or a bad accident that happened to someone you know, or maybe even you. You could write exactly what happened or you could write the story and add little parts that aren't true but could have happened to make the story sound a little more interesting. You could even add some parts that would grab the reader's attention and make them feel how you felt. The key to writing a realistic story is to make it believable, that it really did or really could happen.